PRACTICAL ORGANIC CHEMISTRY as before, and heated with a little animal charcoal (5 — 10 grams) for half hour and then filtered. Yield, 30 — 35 grams. Properties.— Rhombic plates ; m.p. 112° ; b.p. 295°. Reaction. — Introduce about 0*5 gram of the substance into a test-tube, and* add 3 c.c. concentrated hydrochloric acid. T3oil for a minute. On diluting with water, a clear solution is ob- tained. See Appendix, p. 278. PREPARATION 55. p-Bromacetanilide, C0H4 \--- T Remitters, Ber., 1874, 7, 346. 5 grms. acetanilide. 25 c.c. glacial acetic acid. 6 grms. bromine. ^ Dissolve the acetanilide in the acetic acid in a flask (-| litre), and add gradually the bromine, dissolved in about twice its volume of glacial acetic acid, and shake well. When tlie bromine has been added, let the mixture stand \ hour rind then pour into 200 c.c. water and rinse out with water. Filter the crystalline precipitate at the pump and wash three or four times with water. Press it well down and let it clrnin. Dissolve the moist substance in spirit (about 60 c.c.) ;mcl pour into a beaker to crystallise. Filter the crystals, wjtsh with a little dilute spirit, and dry on filter paper. Yield 6 — 7 grams. C0H6NH.C2H3O + Br2 = C6H4Br.NH.C2H;5O4-HBr Properties.-^Colourless needles; m.p. 165 — 166°. On liy- drolysis with concentrated hydrochloric acid, /-bromaniline is formed (see above reaction for acetanilide).